1. The quality of being impossible; impracticability. They confound difficulty with impossibility. (South)
2. An impossible thing; that which can not be thought, done, or endured. Impossibilities! O, no, there's none. (Cowley)
3. Inability; helplessness. Logical impossibility, a condition or statement involving contradiction or absurdity; as, that a thing can be and not be at the same time. See principle of Contradiction, under Contradiction.